Joanna Birriel was killed while visiting one of Guatemala’s most powerful prisoners in jail

The riot began when a fellow inmate threw a hand grenade at Lima – banged up for the murder of a bishop bludgeoned to death with a concrete block in 1998 – and supporters protecting him attacked their rivals with guns.

It was previously known that an Argentine woman visitor had been killed, but her identity only emerged this afternoon.

Officials said she visited Lima – who prosecutors claim built a multimillion pound illegal prison empire based on threats and corruption – once a month.

The gangster’s brother Luis Alberto said the model had worked for them as an advisor for a bio-health park company.